Microbial transformations of labelled nitrogen in a clear-cut pine plantation
Peter M Vitousek1,2, Steven W Andariese1,2
1Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
Abstract:
Labelled nitrogen was used to evaluate the effects of intensive forest management on soil nitrogen transformations. The total release of N into inorganic forms (ammonium plus nitrate) was much greater than net N mineralization in all treatments. Immobilization of N by microbes was greatest in minimally-treated harvested plots, while the turnover of N within soil microbes was greatest in intensively-treated plots. Ammonium was immobilized 2.4-3.2 times more rapidly than nitrate in havested plots; nitrification in disturbed sites could thus increase the availability of N to regrowing vegetation.
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